Finding the Fourth Proportional to 196,540.04, 271,141.20 and 128,438.82

Step by Step Solution

1. Step 1: Write the proportion equation
   196,540.04 : 271,141.20 = 128,438.82 : x
2. Step 2: Convert to fraction form
   196,540.04/271,141.20 = 128,438.82/x
3. Step 3: Cross multiply
   196,540.04x = 271,141.20 × 128,438.82
4. Step 4: Simplify right side
   196,540.04x = 34,825,055,781.38
5. Step 5: Solve for x
   x = 34,825,055,781.38/196,540.04
6. Step 6: Final answer
   x = 177,190.64